Bug#336774: One more backtrace, different path again

[Keith Willoughby <keith.willoughby@gmail.com>]

(gdb) bt
#0  0x080ecc33 in NVSync (pScrn=0x8ba2368) at nv_xaa.c:301
#1  0x083c74d1 in XAAComposite (op=3 '\003', pSrc=0x8e54840,
pMask=0x8e548b0, pDst=0x9458600, xSrc=112, ySrc=17, xMask=112,
    yMask=17, xDst=897, yDst=33, width=10, height=5) at xaaPict.c:522
#2  0x08694ead in cwComposite (op=3 '\003', pSrcPicture=0x8e54840,
pMskPicture=0x8e548b0, pDstPicture=0x9458600, xSrc=112,
    ySrc=17, xMsk=112, yMsk=17, xDst=897, yDst=33, width=10, height=5)
at cw_render.c:269
#3  0x08687c94 in damageComposite (op=3 '\003', pSrc=0x8e54840,
pMask=0x8e548b0, pDst=0x9458600, xSrc=112, ySrc=17,
    xMask=112, yMask=17, xDst=897, yDst=33, width=10, height=5) at damage.c:517
#4  0x0897fb0e in CompositePicture (op=3 '\003', pSrc=0x8e54840,
pMask=0x8e548b0, pDst=0x9458600, xSrc=112, ySrc=17,
    xMask=112, yMask=17, xDst=897, yDst=33, width=10, height=5) at
picture.c:1358
#5  0x08981b2c in ProcRenderComposite (client=0x8e3ddf8) at render.c:729
#6  0x08984350 in ProcRenderDispatch (client=0x8e3ddf8) at render.c:1846
#7  0x0851233e in Dispatch () at dispatch.c:455
#8  0x08529a91 in main (argc=7, argv=0xbff94b24, envp=0xbff94b44) at main.c:476
(gdb)